All Purpose Dual USB Car Adaptor Fast Charger features bluetooth wireless FM transmitter with MP3 radio enabled. Dual USB port allows you to charge devices at the same time.&nbsp; Features: - One key answer allowing handsfree phone calls - Dual USB port fast charger; allows 2 devices at the same time - Built in microphone - Supports MP3 music - TF card u disk - Radio transmitter Specifications: Working Voltage limits: 9 - 26 V Operating Voltage: DC12 V - 24 V USB1 Output: 5V/2.1A USB2 Output: 5V/1.0A ; USB reader Flash music. Support Play format: MP3 Working Temp: 0 - 50 BT Version: Version 5.0 + EDR Bluetooth transmission distance: 10 M Bluetooth Sound Processing: A2DP - Advance Audio Distribution Profile Bluetooth Microphone Effective Range: 0.5 - 2 M FM Transmission Frequency: 87.5 - 108 M h z Package includes: 1 x USB Car Adaptor Fast Charger